Compute the nonnegative rank of a nonnegative matrix

[vprusso]

The nonnegative rank of a matrix, $A$, is defined as the smallest integer $k$ such that there exists nonnegative matrices $L$ and $R$ where $L$ is a $n \times k$ matrix and where $R$ is a $k \times m$ matrix such that $A = LR$.

https://core.ac.uk/download/pdf/82127902.pdf